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+(************************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(************************************************************************)
+
+open Names
+open Libnames
+
+(** The kinds of existential variable *)
+
+(** Should the obligation be defined (opaque or transparent (default)) or
+ defined transparent and expanded in the term? *)
+
+type obligation_definition_status = Define of bool | Expand
+
+type t =
+ | ImplicitArg of global_reference * (int * identifier option)
+ * bool (** Force inference *)
+ | BinderType of name
+ | QuestionMark of obligation_definition_status
+ | CasesType
+ | InternalHole
+ | TomatchTypeParameter of inductive * int
+ | GoalEvar
+ | ImpossibleCase
+ | MatchingVar of bool * identifier